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UDF Maximum number of parameters ??

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  • UDF Maximum number of parameters ??

    Does anybody know what the maximum number of parameters is that one can send with an UDF ?

  • #2
    Re: UDF Maximum number of parameters ??

    Originally posted by M.Richard View Post
    Does anybody know what the maximum number of parameters is that one can send with an UDF ?
    I never tested for a limit, but I have seen working ones with 12 or so. There is probably, no practical limit in Alpha (I'm guessing if there is, it's probably at a power of 2, such as 256, but the structure of Alpha's compilations doesn't seem to have anything that should limit it).

    That said, if you have a lot of variables to pass, it is best to assign them as properties of one pointer, then pass the pointer to the UDF. However, pointers are passed by reference, so any change to a property in the UDF changes the value of the property in the pointer of the calling code (the pointers don't have to have the same name in the calling code and the parameter name in the UDF, but the properties will have the same name, because it is really the same)

    It is my practice, and recommend in most cases, not to change any values of the pointer properties unless your intent is to return 1 or more values back to the calling code. This makes debugging much easier by making a "pure" function.

    When I need to return a lot of values, I return a different pointer for the function return, and that has all the return properties I want to return.

    Ira J. Perlow
    Computer Systems Design

    CSDA A5 Products
    New - Free CSDA DiagInfo - v1.39, 30 Apr 2013
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    • #3
      Re: UDF Maximum number of parameters ??

      Thank you for your response Ira!


      • #4
        Re: UDF Maximum number of parameters ??

        I created a long UDF which after so many characters would fail.....can not remember exactly what the number was but the function was basically this (think I have an updated one somewhere as well that may be a bit different).

        FUNCTION a2Chart_Creation as C (ChartType as C,Setname as C,Col_tablename as C,Col_fieldname as C,Row_table as C,Row_field as C,Tabulation_table as C,Tabulation_field as C,Filter_table="" as C,Chart_Filter="" as C,Order_table="" as C,Order_expression="" as C,ActiveX_Num="1" as C)
        which is 271 characters after the word Function....or 201 using remspecial....

        I just know that when trying to add an additional argument or more characters to the function it would not "read" the last argument(s) and fail. So recommend Ira's method and/or make your arguments character length as small as possible.
        It is only when we forget all our learning that we begin to know.
        It's not what you look at that matters, it's what you see.
        Henry David Thoreau


        • #5
          Re: UDF Maximum number of parameters ??

          Originally posted by MikeC View Post
          I just know that when trying to add an additional argument or more characters to the function it would not "read" the last argument(s) and fail.
          I did a real test in A5v8 thru A5v10, and it complained if the number of arguments was 21 or greater. So, the number of parameter limit is 20.

          There may be a line length limit, but I have seen Alpha generated code with the %text% long string format, so I don't think there is a length limit per say, but there may be a physical line limit you may have bumped into.

          Ira J. Perlow
          Computer Systems Design

          CSDA A5 Products
          New - Free CSDA DiagInfo - v1.39, 30 Apr 2013
          CSDA Barcode Functions

          CSDA Code Utility
          CSDA Screen Capture